h_block88

hi i am kind of new here and this is my first rotary car that i am trying to fix.
Its a 90 turbo II with 3 inch downpipe, racing beat exhaust, looks like stock injectors with stock turbo, and a blue jdm spec j ecu, no Egr, no bavc, no cats, no power stering, pre match everythink has been remove that u could do with out it At the beginning it wasnt running due to a bad coil, after replacing the coil it wasn't idling. Than i found out that who ever removed all that didn't put anythink to all of the vacuum niples and there was a huge vacuum leak under the primary injectors.
after fixing all the problems and rebuilding the 2 injectors i took it to parkway and just to see the power of my new car for some reason it was a lot faster that i thought i was at 3rd and 4th gear pushing little over 18psi
is this normal for a stock turbo to put out that much power and i didn't hit no fuel cut at all does that mean i got a hooked up ecu oh and i am sure i dont have fcd cause i just bought one and just found out that i dont even need it

Funkspectrum

iTrader: (5)

No. it's not normal at all...port your wastegate before you blow your engine from overboosting. You shouldn't see any more than 10-12psi TOPS.

h_block88

any idea how is that possible

Turbonut

iTrader: (1)

If the electronics will handle the boost, can't see why you couldn't get 18 lbs out of the stock turbo, not saying it's advisable though.
No consolation, but when the Hallman MBC went haywire this summer, I was at half throttle in 3rd and the boost was at 13lbs. It sure let me know, as the ECU is only programmed to 12lbs.

Turbo II Rotor

iTrader: (2)

Anything after 12psi is just hotter air and no added power. Hotter air = more likely chance of detonation. Pull the turbo and port the wastegate.

myfc3s

iTrader: (2)

TII turbos can hit that high of boost, but not reliable for engine or turbo. I bet your wastegate is stuck closed.

h_block88

no i tough that was the problem but i checked it and it was opening and closing
by the way i don't have the stock boost controller or after market one

Turbonut

iTrader: (1)

The boost controller will not lower the boost, it will only allow the flapper to open when a specific boost is obtained, but if the boost can't be controlled, it will continually keep rising.

Turbo II Rotor

iTrader: (2)

You have a stock turbo and full exhaust. It's boost creep, port the wastegate.

Turbo II Rotor

iTrader: (2)

TII turbos could probably hit 30psi. The point is it's not doing anything but making the air hotter after 12psi.

h_block88

so porting the wastegate should do it? how about a new injectors or front mouth innercooler?

Turbo II Rotor

iTrader: (2)

Yes, use the search function to find out how to port the wastegate. Your ecu is set up for a certain set of injectors, it would not know to correct for the larger injectors.

psychotic7

I would just buy a new turbo...they can be bought pretty cheap on ebay. for stock engine and under 12psi a BB T3/T4 hybrid would spool fast on a rotary and make one fun car. I bought one from precision turbo on ebay two years ago for under $200 with internal WG, it would go to about 10psi with 3" exhaust...had it for about a year with no probs. so my friend bought one for his CRX and still has it to this day so not all ebay turbos are garbage

Archangels

anything over 13psi IMHO is a waste, i found peak power and torque at 13psi....

18psi?, yikes!!!!

Turbo II Rotor

iTrader: (2)

What says he has money for a new turbo and manifold? You lose. Porting the wastegate is free and easy plus there is nothing wrong with his turbo.

Port the wastegate.

/thread.

h_block88

yea why do i need a new turbo for??
ok i am going to try to port the wastegate probley this weekend

Black Knight RX7 FC3S

iTrader: (7)

If you have a stock turbo and have a full exhaust setup, you are taking chances when boost creep hits.

CyberPitz

Same boat as me man. 15 PSI. Port her up, and you'll be grand. I really should do that soon

dean23

i recommend buying or renting a die grinder for the project. a dremel wil work, but it took me many more hours than it should have....

platinumyama32

amen to that, dremel took quite some time, and quite a few carbide bits too cut through all that metal

Romanator

iTrader: (13)

What if he were to upgrade to a bigger internal wastegate instead of porting ? Example an HKS one that`s set for 14.8psi. I recently bought one but still did not put it to the test. I dont know what to expect from it.

stylEmon

iTrader: (2)

i hit about 18psi on the stock turbo as well. Free-flowing exhaust will do that. OF coares, I had larger sec injectors and a MoTeC, but there was no point in boosting that high.

As mentioned earlier, stock turbo is not making any more power past 12-13 psi.

Aaron Cake

iTrader: (1)

Once you've reached the limits you can get via porting, the wastegate is as large as it ever can be. There aren't any upgrades available as doing such a thing would require a complete new hotside casting. At least, there aren't any upgrades cheaply available...

stylEmon

iTrader: (2)

actually aaron, I've seen a S4 log manifold mod'd for an external wastegate!! ;P

It wasn't terribly cost retarded, but I think I'd just upgrade at that point LOL

myersprostatus

iTrader: (2)

LOL 19PSI ON A STOCK TURBO HAHAHHAA.

18psi+stock injectors+stockregulator=KABOOOOOOOOOOOOOOM

i find it very hard to beleive that your motor still runs if it went up to 18psi